Topological Phononic Crystals with One-Way Elastic Edge Waves
Name
PhysRevLett.115.104302.pdf
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549.01 KB
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Author(s)
Wang, Pai
Lu, Ling
Bertoldi, Katia
Date Issued
September 2015
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Wang, Pai et al. “Topological Phononic Crystals with One-Way Elastic Edge Waves.” Physical Review Letters 115, 10 (September 2015): 104302 © 2015 American Physical Society
Version
Final published version
Abstract
We report a new type of phononic crystals with topologically nontrivial band gaps for both longitudinal and transverse polarizations, resulting in protected one-way elastic edge waves. In our design, gyroscopic inertial effects are used to break the time-reversal symmetry and realize the phononic analogue of the electronic quantum (anomalous) Hall effect. We investigate the response of both hexagonal and square gyroscopic lattices and observe bulk Chern numbers of 1 and 2, indicating that these structures support single and multimode edge elastic waves immune to backscattering. These robust one-way phononic waveguides could potentially lead to the design of a novel class of surface wave devices that are widely used in electronics, telecommunication, and acoustic imaging.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.115.104302
